Which country has the longest combined land border?

Russia
United States
Brazil
China
China's combined land border measures 22,117 km (13,743 mi) from the mouth of the Yalu River to the Gulf of Tonkin. China borders 14 nations, more than any other country except Russia, which also borders 14.
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Answers by country

Russia
United States
Brazil
China
answers
flagRepublic of Ireland
52%
4%
0%
42%
21
flagIndia
35%
22%
0%
41%
48
flagAustria
52%
0%
5%
41%
17
flagPakistan
50%
20%
0%
30%
10
flagPoland
54%
11%
6%
26%
13774
flagthe United Kingdom
48%
20%
3%
26%
121
flagUnknown
50%
15%
7%
26%
26
flagGreece
46%
28%
0%
25%
28
flagthe Netherlands
42%
26%
10%
21%
19
flagGermany
57%
16%
4%
20%
97
flagAustralia
61%
15%
0%
19%
26
flagthe United States
48%
25%
6%
18%
238
flagIsrael
45%
27%
9%
18%
11
flagFrance
78%
0%
7%
14%
14
flagItaly
61%
28%
0%
9%
21